Novel techniques are disclosed for detecting discontinuous transmission (DTX) over a communication channel. A received data frame is characterized as one of a Good frame, Erasure, or DTX. If a Good frame is not initially detected, a multi-dimensional quality metric is used to characterize the received frame as either an Erasure or DTX. A two dimensional quality metric may be generated using energy per bit to noise power ratio as a first dimension and re-encoded symbol error count as a second dimension. Alternatively, re-encoded symbol energy may be used as the second dimension of the quality metric. The communication channel may be a CDMA wireless communication channel capable of DTX and the device may be a base station, base station controller, or mobile station.
Legal claims defining the scope of protection, as filed with the USPTO.
1. In a communication device, a method of detecting discontinuous transmission (DTX) comprising: generating a multi-dimensional quality metric; and characterizing a received frame based in part on the multi-dimensional quality metric, wherein generating the multi-dimensional quality metric comprises generating a first quality metric based on a first polynomial; and generating a second quality metric based on a second polynomial.
2. The method of claim 1 , wherein both the first and second polynomials are of the form g0 g1*X g2*Y, where g0, g1, and g2 represent polynomial constants and X and Y represent two dimensions of the multi-dimensional quality metric.
3. The method of claim 2 , wherein the polynomial constants for the first quality metric are different from the polynomial constants for the second quality metric.
4. The method of claim 2 , wherein: the first polynomial is 290 0.014X 53Y; and the second polynomial is 181 0.021X 24Y.
5. The method of claim 1 , wherein the received frame is characterized using the first quality metric when the received frame is a convolutionally encoded frame.
6. The method of claim 5 , wherein the received frame is characterized as a DTX if the first quality metric is less than or equal to a predetermined threshold.
7. The method of claim 5 , wherein the received frame is characterized as an Erasure if the first quality metric is greater than a predetermined threshold.
8. The method of claim 1 , wherein the received frame is characterized using the second quality metric when the received frame is a turbo encoded frame.
9. The method of claim 8 , wherein the received frame is characterized as a DTX if the second quality metric is less than a predetermined threshold.
10. The method of claim 8 , wherein the received frame is characterized as an Erasure if the second quality metric is greater than or equal to a predetermined threshold.
11. The method of claim 1 , wherein the communication device is one of a CDMA base station, CDMA base station controller, or CDMA mobile station.
12. In a communication device, a discontinuous transmission (DTX) detector comprising: means for generating a multi-dimensional quality metric; and means for characterizing a received frame based on the multi-dimensional quality metric, wherein the means for generating the multi-dimensional quality metric comprises means for generating a first quality metric based on a first polynomial; and means for generating a second quality metric based on a second polynomial.
13. The device of claim 12 wherein both the first and second polynomials are of the form g0 g1*X g2*Y, where g0, g1, and g2 represent polynomial constants and X and Y represent two dimensions of the multi-dimensional quality metric.
14. The device of claim 13 , wherein the polynomial constants for the first quality metric are different from the polynomial constants for the second quality metric.
15. The device of claim 13 , wherein: the first polynomial is 290 0.014X 53Y; and the second polynomial is 181 0.021X 24Y.
16. The device of claim 12 , wherein the received frame is characterized using the first quality metric when the received frame is a convolutionally encoded frame.
17. The device of claim 16 , wherein the received frame is characterized as a DTX if the first quality metric is less than or equal to a predetermined threshold.
18. The device of claim 16 , wherein the received frame is characterized as an Erasure if the first quality metric is greater than a predetermined threshold.
19. The device of claim 12 , wherein the received frame is characterized using the second quality metric when the received frame is a turbo encoded frame.
20. The device of claim 19 , wherein the received frame is characterized as a DTX if the second quality metric is less than a predetermined threshold.
21. The device of claim 19 , wherein the received frame is characterized as an Erasure if the second quality metric is greater than or equal to a predetermined threshold.
22. The device of claim 12 , wherein the communication device is one of a CDMA base station, CDMA base station controller, or CDMA mobile station.
23. An article of manufacture comprising: a computer usable medium having computer readable program code means embodied therein for detecting discontinuous transmission (DTX), the computer readable program code means in said article of manufacture comprising: computer readable program code means for generating a multi-dimensional quality metric; and computer readable program code means for characterizing a received frame based in part on the multi-dimensional quality metric, wherein generating the multi-dimensional quality metric comprises generating a first quality metric based on a first polynomial; and generating a second quality metric based on a second polynomial.
24. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for detecting discontinuous transmission (DTX), said method steps comprising: generating a multi-dimensional quality metric; and characterizing a received frame based in part on the multi-dimensional quality metric, wherein generating the multi-dimensional quality metric comprises generating a first quality metric based on a first polynomial; and generating a second quality metric based on a second polynomial.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 31, 2002
August 24, 2004
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